]> err.no Git - linux-2.6/blob - drivers/acpi/resources/rsxface.c
Merge master.kernel.org:/pub/scm/linux/kernel/git/paulus/powerpc
[linux-2.6] / drivers / acpi / resources / rsxface.c
1 /*******************************************************************************
2  *
3  * Module Name: rsxface - Public interfaces to the resource manager
4  *
5  ******************************************************************************/
6
7 /*
8  * Copyright (C) 2000 - 2007, R. Byron Moore
9  * All rights reserved.
10  *
11  * Redistribution and use in source and binary forms, with or without
12  * modification, are permitted provided that the following conditions
13  * are met:
14  * 1. Redistributions of source code must retain the above copyright
15  *    notice, this list of conditions, and the following disclaimer,
16  *    without modification.
17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18  *    substantially similar to the "NO WARRANTY" disclaimer below
19  *    ("Disclaimer") and any redistribution must be conditioned upon
20  *    including a substantially similar Disclaimer requirement for further
21  *    binary redistribution.
22  * 3. Neither the names of the above-listed copyright holders nor the names
23  *    of any contributors may be used to endorse or promote products derived
24  *    from this software without specific prior written permission.
25  *
26  * Alternatively, this software may be distributed under the terms of the
27  * GNU General Public License ("GPL") version 2 as published by the Free
28  * Software Foundation.
29  *
30  * NO WARRANTY
31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41  * POSSIBILITY OF SUCH DAMAGES.
42  */
43
44 #include <acpi/acpi.h>
45 #include <acpi/acresrc.h>
46 #include <acpi/acnamesp.h>
47
48 #define _COMPONENT          ACPI_RESOURCES
49 ACPI_MODULE_NAME("rsxface")
50
51 /* Local macros for 16,32-bit to 64-bit conversion */
52 #define ACPI_COPY_FIELD(out, in, field)  ((out)->field = (in)->field)
53 #define ACPI_COPY_ADDRESS(out, in)                      \
54         ACPI_COPY_FIELD(out, in, resource_type);             \
55         ACPI_COPY_FIELD(out, in, producer_consumer);         \
56         ACPI_COPY_FIELD(out, in, decode);                    \
57         ACPI_COPY_FIELD(out, in, min_address_fixed);         \
58         ACPI_COPY_FIELD(out, in, max_address_fixed);         \
59         ACPI_COPY_FIELD(out, in, info);                      \
60         ACPI_COPY_FIELD(out, in, granularity);               \
61         ACPI_COPY_FIELD(out, in, minimum);                   \
62         ACPI_COPY_FIELD(out, in, maximum);                   \
63         ACPI_COPY_FIELD(out, in, translation_offset);        \
64         ACPI_COPY_FIELD(out, in, address_length);            \
65         ACPI_COPY_FIELD(out, in, resource_source);
66 /* Local prototypes */
67 static acpi_status
68 acpi_rs_match_vendor_resource(struct acpi_resource *resource, void *context);
69
70 static acpi_status
71 acpi_rs_validate_parameters(acpi_handle device_handle,
72                             struct acpi_buffer *buffer,
73                             struct acpi_namespace_node **return_node);
74
75 /*******************************************************************************
76  *
77  * FUNCTION:    acpi_rs_validate_parameters
78  *
79  * PARAMETERS:  device_handle   - Handle to a device
80  *              Buffer          - Pointer to a data buffer
81  *              return_node     - Pointer to where the device node is returned
82  *
83  * RETURN:      Status
84  *
85  * DESCRIPTION: Common parameter validation for resource interfaces
86  *
87  ******************************************************************************/
88
89 static acpi_status
90 acpi_rs_validate_parameters(acpi_handle device_handle,
91                             struct acpi_buffer *buffer,
92                             struct acpi_namespace_node **return_node)
93 {
94         acpi_status status;
95         struct acpi_namespace_node *node;
96
97         ACPI_FUNCTION_TRACE(rs_validate_parameters);
98
99         /*
100          * Must have a valid handle to an ACPI device
101          */
102         if (!device_handle) {
103                 return_ACPI_STATUS(AE_BAD_PARAMETER);
104         }
105
106         node = acpi_ns_map_handle_to_node(device_handle);
107         if (!node) {
108                 return_ACPI_STATUS(AE_BAD_PARAMETER);
109         }
110
111         if (node->type != ACPI_TYPE_DEVICE) {
112                 return_ACPI_STATUS(AE_TYPE);
113         }
114
115         /*
116          * Validate the user buffer object
117          *
118          * if there is a non-zero buffer length we also need a valid pointer in
119          * the buffer. If it's a zero buffer length, we'll be returning the
120          * needed buffer size (later), so keep going.
121          */
122         status = acpi_ut_validate_buffer(buffer);
123         if (ACPI_FAILURE(status)) {
124                 return_ACPI_STATUS(status);
125         }
126
127         *return_node = node;
128         return_ACPI_STATUS(AE_OK);
129 }
130
131 /*******************************************************************************
132  *
133  * FUNCTION:    acpi_get_irq_routing_table
134  *
135  * PARAMETERS:  device_handle   - Handle to the Bus device we are querying
136  *              ret_buffer      - Pointer to a buffer to receive the
137  *                                current resources for the device
138  *
139  * RETURN:      Status
140  *
141  * DESCRIPTION: This function is called to get the IRQ routing table for a
142  *              specific bus. The caller must first acquire a handle for the
143  *              desired bus. The routine table is placed in the buffer pointed
144  *              to by the ret_buffer variable parameter.
145  *
146  *              If the function fails an appropriate status will be returned
147  *              and the value of ret_buffer is undefined.
148  *
149  *              This function attempts to execute the _PRT method contained in
150  *              the object indicated by the passed device_handle.
151  *
152  ******************************************************************************/
153
154 acpi_status
155 acpi_get_irq_routing_table(acpi_handle device_handle,
156                            struct acpi_buffer *ret_buffer)
157 {
158         acpi_status status;
159         struct acpi_namespace_node *node;
160
161         ACPI_FUNCTION_TRACE(acpi_get_irq_routing_table);
162
163         /* Validate parameters then dispatch to internal routine */
164
165         status = acpi_rs_validate_parameters(device_handle, ret_buffer, &node);
166         if (ACPI_FAILURE(status)) {
167                 return_ACPI_STATUS(status);
168         }
169
170         status = acpi_rs_get_prt_method_data(node, ret_buffer);
171         return_ACPI_STATUS(status);
172 }
173
174 ACPI_EXPORT_SYMBOL(acpi_get_irq_routing_table)
175
176 /*******************************************************************************
177  *
178  * FUNCTION:    acpi_get_current_resources
179  *
180  * PARAMETERS:  device_handle   - Handle to the device object for the
181  *                                device we are querying
182  *              ret_buffer      - Pointer to a buffer to receive the
183  *                                current resources for the device
184  *
185  * RETURN:      Status
186  *
187  * DESCRIPTION: This function is called to get the current resources for a
188  *              specific device. The caller must first acquire a handle for
189  *              the desired device. The resource data is placed in the buffer
190  *              pointed to by the ret_buffer variable parameter.
191  *
192  *              If the function fails an appropriate status will be returned
193  *              and the value of ret_buffer is undefined.
194  *
195  *              This function attempts to execute the _CRS method contained in
196  *              the object indicated by the passed device_handle.
197  *
198  ******************************************************************************/
199 acpi_status
200 acpi_get_current_resources(acpi_handle device_handle,
201                            struct acpi_buffer *ret_buffer)
202 {
203         acpi_status status;
204         struct acpi_namespace_node *node;
205
206         ACPI_FUNCTION_TRACE(acpi_get_current_resources);
207
208         /* Validate parameters then dispatch to internal routine */
209
210         status = acpi_rs_validate_parameters(device_handle, ret_buffer, &node);
211         if (ACPI_FAILURE(status)) {
212                 return_ACPI_STATUS(status);
213         }
214
215         status = acpi_rs_get_crs_method_data(node, ret_buffer);
216         return_ACPI_STATUS(status);
217 }
218
219 ACPI_EXPORT_SYMBOL(acpi_get_current_resources)
220
221 #ifdef ACPI_FUTURE_USAGE
222 /*******************************************************************************
223  *
224  * FUNCTION:    acpi_get_possible_resources
225  *
226  * PARAMETERS:  device_handle   - Handle to the device object for the
227  *                                device we are querying
228  *              ret_buffer      - Pointer to a buffer to receive the
229  *                                resources for the device
230  *
231  * RETURN:      Status
232  *
233  * DESCRIPTION: This function is called to get a list of the possible resources
234  *              for a specific device. The caller must first acquire a handle
235  *              for the desired device. The resource data is placed in the
236  *              buffer pointed to by the ret_buffer variable.
237  *
238  *              If the function fails an appropriate status will be returned
239  *              and the value of ret_buffer is undefined.
240  *
241  ******************************************************************************/
242 acpi_status
243 acpi_get_possible_resources(acpi_handle device_handle,
244                             struct acpi_buffer *ret_buffer)
245 {
246         acpi_status status;
247         struct acpi_namespace_node *node;
248
249         ACPI_FUNCTION_TRACE(acpi_get_possible_resources);
250
251         /* Validate parameters then dispatch to internal routine */
252
253         status = acpi_rs_validate_parameters(device_handle, ret_buffer, &node);
254         if (ACPI_FAILURE(status)) {
255                 return_ACPI_STATUS(status);
256         }
257
258         status = acpi_rs_get_prs_method_data(node, ret_buffer);
259         return_ACPI_STATUS(status);
260 }
261
262 ACPI_EXPORT_SYMBOL(acpi_get_possible_resources)
263 #endif                          /*  ACPI_FUTURE_USAGE  */
264
265 /*******************************************************************************
266  *
267  * FUNCTION:    acpi_set_current_resources
268  *
269  * PARAMETERS:  device_handle   - Handle to the device object for the
270  *                                device we are setting resources
271  *              in_buffer       - Pointer to a buffer containing the
272  *                                resources to be set for the device
273  *
274  * RETURN:      Status
275  *
276  * DESCRIPTION: This function is called to set the current resources for a
277  *              specific device. The caller must first acquire a handle for
278  *              the desired device. The resource data is passed to the routine
279  *              the buffer pointed to by the in_buffer variable.
280  *
281  ******************************************************************************/
282 acpi_status
283 acpi_set_current_resources(acpi_handle device_handle,
284                            struct acpi_buffer *in_buffer)
285 {
286         acpi_status status;
287         struct acpi_namespace_node *node;
288
289         ACPI_FUNCTION_TRACE(acpi_set_current_resources);
290
291         /* Validate the buffer, don't allow zero length */
292
293         if ((!in_buffer) || (!in_buffer->pointer) || (!in_buffer->length)) {
294                 return_ACPI_STATUS(AE_BAD_PARAMETER);
295         }
296
297         /* Validate parameters then dispatch to internal routine */
298
299         status = acpi_rs_validate_parameters(device_handle, in_buffer, &node);
300         if (ACPI_FAILURE(status)) {
301                 return_ACPI_STATUS(status);
302         }
303
304         status = acpi_rs_set_srs_method_data(node, in_buffer);
305         return_ACPI_STATUS(status);
306 }
307
308 ACPI_EXPORT_SYMBOL(acpi_set_current_resources)
309
310 /******************************************************************************
311  *
312  * FUNCTION:    acpi_resource_to_address64
313  *
314  * PARAMETERS:  Resource        - Pointer to a resource
315  *              Out             - Pointer to the users's return buffer
316  *                                (a struct acpi_resource_address64)
317  *
318  * RETURN:      Status
319  *
320  * DESCRIPTION: If the resource is an address16, address32, or address64,
321  *              copy it to the address64 return buffer. This saves the
322  *              caller from having to duplicate code for different-sized
323  *              addresses.
324  *
325  ******************************************************************************/
326 acpi_status
327 acpi_resource_to_address64(struct acpi_resource *resource,
328                            struct acpi_resource_address64 *out)
329 {
330         struct acpi_resource_address16 *address16;
331         struct acpi_resource_address32 *address32;
332
333         if (!resource || !out) {
334                 return (AE_BAD_PARAMETER);
335         }
336
337         /* Convert 16 or 32 address descriptor to 64 */
338
339         switch (resource->type) {
340         case ACPI_RESOURCE_TYPE_ADDRESS16:
341
342                 address16 = (struct acpi_resource_address16 *)&resource->data;
343                 ACPI_COPY_ADDRESS(out, address16);
344                 break;
345
346         case ACPI_RESOURCE_TYPE_ADDRESS32:
347
348                 address32 = (struct acpi_resource_address32 *)&resource->data;
349                 ACPI_COPY_ADDRESS(out, address32);
350                 break;
351
352         case ACPI_RESOURCE_TYPE_ADDRESS64:
353
354                 /* Simple copy for 64 bit source */
355
356                 ACPI_MEMCPY(out, &resource->data,
357                             sizeof(struct acpi_resource_address64));
358                 break;
359
360         default:
361                 return (AE_BAD_PARAMETER);
362         }
363
364         return (AE_OK);
365 }
366
367 ACPI_EXPORT_SYMBOL(acpi_resource_to_address64)
368
369 /*******************************************************************************
370  *
371  * FUNCTION:    acpi_get_vendor_resource
372  *
373  * PARAMETERS:  device_handle   - Handle for the parent device object
374  *              Name            - Method name for the parent resource
375  *                                (METHOD_NAME__CRS or METHOD_NAME__PRS)
376  *              Uuid            - Pointer to the UUID to be matched.
377  *                                includes both subtype and 16-byte UUID
378  *              ret_buffer      - Where the vendor resource is returned
379  *
380  * RETURN:      Status
381  *
382  * DESCRIPTION: Walk a resource template for the specified evice to find a
383  *              vendor-defined resource that matches the supplied UUID and
384  *              UUID subtype. Returns a struct acpi_resource of type Vendor.
385  *
386  ******************************************************************************/
387 acpi_status
388 acpi_get_vendor_resource(acpi_handle device_handle,
389                          char *name,
390                          struct acpi_vendor_uuid * uuid,
391                          struct acpi_buffer * ret_buffer)
392 {
393         struct acpi_vendor_walk_info info;
394         acpi_status status;
395
396         /* Other parameters are validated by acpi_walk_resources */
397
398         if (!uuid || !ret_buffer) {
399                 return (AE_BAD_PARAMETER);
400         }
401
402         info.uuid = uuid;
403         info.buffer = ret_buffer;
404         info.status = AE_NOT_EXIST;
405
406         /* Walk the _CRS or _PRS resource list for this device */
407
408         status =
409             acpi_walk_resources(device_handle, name,
410                                 acpi_rs_match_vendor_resource, &info);
411         if (ACPI_FAILURE(status)) {
412                 return (status);
413         }
414
415         return (info.status);
416 }
417
418 ACPI_EXPORT_SYMBOL(acpi_get_vendor_resource)
419
420 /*******************************************************************************
421  *
422  * FUNCTION:    acpi_rs_match_vendor_resource
423  *
424  * PARAMETERS:  acpi_walk_resource_callback
425  *
426  * RETURN:      Status
427  *
428  * DESCRIPTION: Match a vendor resource via the ACPI 3.0 UUID
429  *
430  ******************************************************************************/
431 static acpi_status
432 acpi_rs_match_vendor_resource(struct acpi_resource *resource, void *context)
433 {
434         struct acpi_vendor_walk_info *info = context;
435         struct acpi_resource_vendor_typed *vendor;
436         struct acpi_buffer *buffer;
437         acpi_status status;
438
439         /* Ignore all descriptors except Vendor */
440
441         if (resource->type != ACPI_RESOURCE_TYPE_VENDOR) {
442                 return (AE_OK);
443         }
444
445         vendor = &resource->data.vendor_typed;
446
447         /*
448          * For a valid match, these conditions must hold:
449          *
450          * 1) Length of descriptor data must be at least as long as a UUID struct
451          * 2) The UUID subtypes must match
452          * 3) The UUID data must match
453          */
454         if ((vendor->byte_length < (ACPI_UUID_LENGTH + 1)) ||
455             (vendor->uuid_subtype != info->uuid->subtype) ||
456             (ACPI_MEMCMP(vendor->uuid, info->uuid->data, ACPI_UUID_LENGTH))) {
457                 return (AE_OK);
458         }
459
460         /* Validate/Allocate/Clear caller buffer */
461
462         buffer = info->buffer;
463         status = acpi_ut_initialize_buffer(buffer, resource->length);
464         if (ACPI_FAILURE(status)) {
465                 return (status);
466         }
467
468         /* Found the correct resource, copy and return it */
469
470         ACPI_MEMCPY(buffer->pointer, resource, resource->length);
471         buffer->length = resource->length;
472
473         /* Found the desired descriptor, terminate resource walk */
474
475         info->status = AE_OK;
476         return (AE_CTRL_TERMINATE);
477 }
478
479 ACPI_EXPORT_SYMBOL(acpi_rs_match_vendor_resource)
480
481 /*******************************************************************************
482  *
483  * FUNCTION:    acpi_walk_resources
484  *
485  * PARAMETERS:  device_handle   - Handle to the device object for the
486  *                                device we are querying
487  *              Name            - Method name of the resources we want
488  *                                (METHOD_NAME__CRS or METHOD_NAME__PRS)
489  *              user_function   - Called for each resource
490  *              Context         - Passed to user_function
491  *
492  * RETURN:      Status
493  *
494  * DESCRIPTION: Retrieves the current or possible resource list for the
495  *              specified device. The user_function is called once for
496  *              each resource in the list.
497  *
498  ******************************************************************************/
499
500 acpi_status
501 acpi_walk_resources(acpi_handle device_handle,
502                     char *name,
503                     acpi_walk_resource_callback user_function, void *context)
504 {
505         acpi_status status;
506         struct acpi_buffer buffer;
507         struct acpi_resource *resource;
508         struct acpi_resource *resource_end;
509
510         ACPI_FUNCTION_TRACE(acpi_walk_resources);
511
512         /* Parameter validation */
513
514         if (!device_handle || !user_function || !name ||
515             (!ACPI_COMPARE_NAME(name, METHOD_NAME__CRS) &&
516              !ACPI_COMPARE_NAME(name, METHOD_NAME__PRS))) {
517                 return_ACPI_STATUS(AE_BAD_PARAMETER);
518         }
519
520         /* Get the _CRS or _PRS resource list */
521
522         buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER;
523         status = acpi_rs_get_method_data(device_handle, name, &buffer);
524         if (ACPI_FAILURE(status)) {
525                 return_ACPI_STATUS(status);
526         }
527
528         /* Buffer now contains the resource list */
529
530         resource = ACPI_CAST_PTR(struct acpi_resource, buffer.pointer);
531         resource_end =
532             ACPI_ADD_PTR(struct acpi_resource, buffer.pointer, buffer.length);
533
534         /* Walk the resource list until the end_tag is found (or buffer end) */
535
536         while (resource < resource_end) {
537
538                 /* Sanity check the resource */
539
540                 if (resource->type > ACPI_RESOURCE_TYPE_MAX) {
541                         status = AE_AML_INVALID_RESOURCE_TYPE;
542                         break;
543                 }
544
545                 /* Invoke the user function, abort on any error returned */
546
547                 status = user_function(resource, context);
548                 if (ACPI_FAILURE(status)) {
549                         if (status == AE_CTRL_TERMINATE) {
550
551                                 /* This is an OK termination by the user function */
552
553                                 status = AE_OK;
554                         }
555                         break;
556                 }
557
558                 /* end_tag indicates end-of-list */
559
560                 if (resource->type == ACPI_RESOURCE_TYPE_END_TAG) {
561                         break;
562                 }
563
564                 /* Get the next resource descriptor */
565
566                 resource =
567                     ACPI_ADD_PTR(struct acpi_resource, resource,
568                                  resource->length);
569         }
570
571         ACPI_FREE(buffer.pointer);
572         return_ACPI_STATUS(status);
573 }
574
575 ACPI_EXPORT_SYMBOL(acpi_walk_resources)